EP1439957A2 - Nicht ausgerichtete polypropylenfolie - Google Patents
Nicht ausgerichtete polypropylenfolieInfo
- Publication number
- EP1439957A2 EP1439957A2 EP02800592A EP02800592A EP1439957A2 EP 1439957 A2 EP1439957 A2 EP 1439957A2 EP 02800592 A EP02800592 A EP 02800592A EP 02800592 A EP02800592 A EP 02800592A EP 1439957 A2 EP1439957 A2 EP 1439957A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- film
- polypropylene
- polypropylene composition
- water vapour
- oriented polypropylene
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/10—Homopolymers or copolymers of propene
Definitions
- the invention relates to a non-oriented polypropylene film with reduced water vapour transmission rate comprised of a polypropylene composition.
- Polypropylene films are used in many commercial applications.
- One particularly important application is the packaging of food products.
- Films employed in the food packaging industry are chosen and/or designed to provide characteristics necessary for proper food containment. Such characteristics include water vapour barrier properties, oxygen and gas barrier properties and flavour and aroma barrier properties. These improved barrier properties are advantageous also in non-food packaging applications, for example for the production of blister packages containing pharmaceutical products, detergents or other moisture-sensitive articles.
- Polypropylene is a polymer commonly employed in the manufacture of films used in the food packaging industry. In the case of multilayer films, polypropylene is typically used in the base or core layer. Often the polypropylene layer is modified to obtain desired characteristics which are not inherent in unmodified polypropylene. For example, resin modifiers and/or additives may be blended with the polypropylene.
- WO 96/02388 discloses biaxially oriented polypropylene (BOPP) films from highly crystalline polypropylene and a moisture barrier improving amount of a polyterpene resin.
- the addition of moisture barrier improving compounds however has the disadvantage of being rather costly and sharply increases the raw material price. It also leads to a reduced toughness of the produced film.
- MOPP onoaxially oriented PP film
- a solid-state orientation step below the melting temperature is applied before winding.
- the resulting films (used e.g. for adhesive tapes or packaging tapes) have a higher crystallinity and stiffness, which goes along with reduced WVTR as compared to cast or roll stack films.
- a disadvantage of such films is the severe anisotropy of mechanical properties, the limited transparency caused by oriented crystals and a strong tendency to split in processing direction.
- the cost for a setup for MOPP production is already significantly higher than for a standard cast film unit.
- BOPP Biaxially oriented PP film
- BOPP Biaxially oriented polypropylene
- Orientation and properties are determined by the draw ratio and details of the process; the films have generally the highest crystallinity and stiffness achievable.
- the main disadvantages of the BOPP process are the high requirements to the polymers used for this process (a rather high molecular weight and broad molecular weight distribution combined with limited isotacticity are required) and the dimension and cost of the necessary machines, which exceed those for every other technology for the production of PP film.
- OPP oriented polypropylene films
- non-oriented polypropylene films have only a limited barrier function against water vapour and even less so against oxygen or carbon dioxide.
- these properties are greatly improved - however, at the price of significantly higher production costs and a certain brittleness as well as strongly anisotropic mechanical properties and shrinkage- Due to these disadvantages non-oriented polypropylene films are gradually gaining in importance over OPP because of their lower machinery and conversion costs.
- a polypropylene composition being comprised of a propylene homopolymer and/or a propylene random copolymer which comprises up to 1.5 wt% of one or more C -C 8 ⁇ -olefins and/or ethylene, which polypropylene composition has an isotacticity ⁇ 0.96, a crystallisation temperature of T 0 ⁇ 120 °C (determined by DSC according to ISO 3146) and a shear thinning index SHI (0/50) ⁇ 10 (calculated from the flow curve at 200 °C).
- Isotacticity is determined by FTIR measurement and calculated as peak ratio A 99B fA 97 3 (described in T.Sundell, H. Fagerholm & H. Crozier, Isotacticity determination of polypropylene using FT-Raman spectroscopy, Polymer 37, 1996, 3227-31 ).
- Crystallisation temperatures are determined by DSC measurement according to ISO 3146 at a cooling rate of 10 K/min after a first heating to 200 °C.
- the shear thinning index SHI is calculated from the flow curve ⁇ ( ⁇ ) at 200 °C - which can be determined with a capillary rheometer according to ISO 11443 or calculated from the complex shear viscosity determined with a plate-plate rheometer according to ISO 6271 -10 using the well-known "Cox-Merz rule" relating the shear viscosity to the dynamic viscosity as described in W.P. Cox & E.H. Merz, J.Polym.Sci. 28(1958) 619-623.
- the SHI (0/50) is defined as the ratio between the zero shear viscosity ( ⁇ 0 ) and the viscosity at a stress ( ⁇ ) value of 50000 Pa.
- the shear thinning index is proportional to the broadness of the molecular weight distribution (MWD) of the polymer.
- the MWD curve shows two maxima or one maximum and a pronounced shoulder.
- the higher molecular weight tail will be limited in practice.
- melt flow rate is that quantity of polymer in grams which the test apparatus standardised to DIN 53735 extrudes within 10 minutes at a temperature of 230 °C under a weight of 2.16 kg.
- Comonomer contents were calculated from polymerisation parameters, i.e. the monomer consumption.
- Water vapour transmission rates are determined under tropical conditions (38 °C, 90 % rel. humidity) according to DIN 53122/1.
- Water vapour transmission rates are determined on 50 ⁇ m cast films.
- the polypropylene composition has an isotacticity ⁇ 0.96,. preferably ⁇ 0.97, more preferably ⁇ 0.98.
- a higher crystallinity will mean higher density and, subsequently, lower water vapour transmission rate.
- the crystallinity potential of a specific material is, however, only partially utilised due to the high cooling rates in the process.
- a too high crystallinity can lead to brittleness of the film and to problems in transparency and gloss of the film.
- the polypropylene composition has a crystallisation temperature Tc ⁇ 120 °C, preferably ⁇ 123 °C, more preferably ⁇ 125 °C.
- the crystallisation temperature can be correlated both to the molecular weight distribution of the polymer and to the final crystallinity achieved.
- An increased content of high molecular weight molecules will normally increase the crystallisation temperature, which will also result in an increased crystallinity.
- the extent of these effects is, however, depending on details of the molecular weight distribution and the molecular structure as well as - for the final crystallinity - on the type and conditions of processing.
- the polypropylene composition has a shear thinning index SHI (0/50) ⁇ 10, preferably ⁇ 12, more preferably ⁇ 15.
- SHI is a measure for the processing behaviour of a polymer with higher values indicating a broad to bimodal molecular weight distribution.
- the polypropylene composition is comprised of a propylene random copolymer which comprises 99.7 wt% of propylene and 0.3 wt% of ethylene.
- Random copolymers of propylene and ethylene have the additional advantage of good optical properties, e.g. reduced haze and increased surface gloss.
- the polypropylene composition has a shear thinning index SHI (0/50) ⁇ 14 and the film has a water vapour transmission rate ⁇ 2.00 g.m “2 .day “1 (determined according to DIN 53122/1 on a 50 ⁇ m cast film).
- Non-oriented polypropylene films with the above properties are particularly preferred, because they are the best suited substitutes for BOPP films where water barrier properties are concerned.
- Films according to the invention may be produced by any method which is suitable for obtaining non-oriented films. Cast film technology, roll stack technology and rapid quenching technologies, e.g. waterbath or steel belt technology, are particularly preferred.
- the molten polymer is extruded through a slot die fed by a (normally single-screw) extruder onto a first cooled roll, the so- called chill-roll. From this roll, the already solidified film is taken up by a second roll (nip roll or takeup roll) and transported to a winding device after trimming the edges. Only a very limited amount of orientation is created in the film, which is determined by the ratio between die thickness and film thickness or the extrusion speed and the take-up speed, respectively. Due to its technical simplicity, cast film technology is a very economical and easy-to-handle process.
- the films resulting from this technology usually have a thickness of from 30 to 500 ⁇ m and are characterised by good transparency and rather isotropic mechanical properties (limited stiffness, high toughness).
- this is an expansion of the cast film technology to allow higher film thickness, mostly for thermoforming applications.
- the still partially molten film is transferred to a roll stack similar to a calendering setup, in which the final film thickness and orientation of the film are determined.
- the final film thickness can range from 300 to 2000 ⁇ m, orientation and anisotropy of the mechanical properties are low.
- Waterbath or steel-belt technology These processes are targeted at reaching very high cooling rates in the film forming process, thus reducing the film crystallinity and stiffness while optimising thermoforming properties and transparency.
- the molten film from a flat die is quenched immediately between polished steel belts cooled from the backside or in a cold water bath, from which it is taken to the winding device. Films produced this way have the lowest possible crystallinity and stiffness.
- the polypropylene composition comprises a nucleating agent.
- nucleation it is known that mechanical properties of polymers may be further improved by nucleation.
- ⁇ -nucleation is preferred.
- a wide range of nucleating agents is suitable for accomplishing the desired degree of ⁇ -nucleation.
- CCPP further nucleation method, "CCPP" in the examples, is a special reactor technique, where the catalyst is prepolymerised with monomers like vinylcyclohexane (VCH). This method is described in greater detail in e.g. EP 0316 187 A2.
- a polypropylene composition being comprised of a propylene homopolymer and/or a propylene random copolymer which comprises up to
- polypropylene composition has an isotacticity ⁇ 0.96, a crystallisation temperature of T c ⁇ 120 °C (determined by DSC according to ISO 3146) and a shear thinning index SHI (0/50) ⁇ 10 (calculated from the flow curve at 200 °C) for the production of a non-oriented polypropylene film which has a reduced water vapour transmission rate.
- the polypropylene film has a water vapour transmission rate of ⁇ 3.00 g.m “2 .day “1 (determined according to DIN 53122/1 on a 50 ⁇ m cast film).
- a polypropylene composition which has a shear thinning index SHI (0/50) ⁇ 14 and the film has a water vapour transmission rate ⁇ 2.00 g.m '2 .day “1 (determined according to DIN 53122/1 on a 50 ⁇ m cast film).
- a polypropylene composition which is comprised of a propylene homopolymer which polypropylene composition has an isotacticity ⁇ 0.96.
- the polypropylene composition is coextruded into one of the layers of a two- or multi-layered film.
- the films according to the invention can be utilised in a wide range of applications, especially in food or non-food packaging applications.
- All films were produced from propylene homo- or copolymers, which are characterised by their analytical data in tablel .
- the films were produced in cast film technology on a single screw extruder with a barrel diameter of 52 mm and a slot die of 800 x 0.5 mm in combination with a chill- and a takeup-roll. Melt temperature was 240 °C in the die; the chill-roll was kept at 15 °C and the takeup roll at 20 °C. A film thickness of 50 ⁇ m was adjusted through the ratio between extruder output and takeoff speed.
- Examples 1 , 2 and 3 are according to the invention, examples C1 and C2 are comparative examples.
- All of the inventive films show remarkably improved water barrier properties. Optical properties are maintained in an acceptable range.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Medicinal Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Wrappers (AREA)
- Laminated Bodies (AREA)
- Moulding By Coating Moulds (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02800592A EP1439957B1 (de) | 2001-10-04 | 2002-10-02 | Nicht ausgerichtete polypropylenfolie |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01123752A EP1300239A1 (de) | 2001-10-04 | 2001-10-04 | Nicht-orientierter Polypropylenfilm |
EP01123752 | 2001-10-04 | ||
EP02800592A EP1439957B1 (de) | 2001-10-04 | 2002-10-02 | Nicht ausgerichtete polypropylenfolie |
PCT/EP2002/011050 WO2003031174A2 (en) | 2001-10-04 | 2002-10-02 | Non-oriented polypropylene film |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1439957A2 true EP1439957A2 (de) | 2004-07-28 |
EP1439957B1 EP1439957B1 (de) | 2005-07-06 |
Family
ID=8178846
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01123752A Withdrawn EP1300239A1 (de) | 2001-10-04 | 2001-10-04 | Nicht-orientierter Polypropylenfilm |
EP02800592A Expired - Lifetime EP1439957B1 (de) | 2001-10-04 | 2002-10-02 | Nicht ausgerichtete polypropylenfolie |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01123752A Withdrawn EP1300239A1 (de) | 2001-10-04 | 2001-10-04 | Nicht-orientierter Polypropylenfilm |
Country Status (8)
Country | Link |
---|---|
EP (2) | EP1300239A1 (de) |
JP (1) | JP2005504864A (de) |
CN (1) | CN100572048C (de) |
AT (1) | ATE299097T1 (de) |
DE (1) | DE60204974T2 (de) |
ES (1) | ES2243796T3 (de) |
RU (1) | RU2294343C2 (de) |
WO (1) | WO2003031174A2 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2418237A1 (de) | 2010-08-12 | 2012-02-15 | Borealis AG | Leicht abziehbarer Polypropylen-Film ohne Nocke |
WO2012020106A1 (en) | 2010-08-12 | 2012-02-16 | Borealis Ag | Easy tear polypropylene film without notch |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100363417C (zh) * | 2005-01-28 | 2008-01-23 | 中国石油化工股份有限公司 | 丙烯聚合物组合物和由其制备的双向拉伸薄膜 |
ATE388175T1 (de) * | 2005-04-12 | 2008-03-15 | Borealis Tech Oy | Polyethylenfilm mit verbesserter verarbeitbarkeit und verbesserten mechanischen eigenschaften |
EP1726602A1 (de) * | 2005-05-27 | 2006-11-29 | Borealis Technology Oy | Hochkristallines Polypropylen |
JP2008062524A (ja) * | 2006-09-07 | 2008-03-21 | Tokuyama Corp | 熱成形シート積層用フィルム |
KR101061632B1 (ko) * | 2007-01-11 | 2011-09-01 | 주식회사 엘지화학 | 전중합된 지글러-나타계 촉매를 이용한 프로필렌의중합방법 및 이에 의해 제조된 폴리프로필렌 |
EP2338930A1 (de) * | 2009-12-23 | 2011-06-29 | Borealis AG | Blasfolienqualität mit verbesserter Festigkeit, Transparenz und verbessertem Verarbeitungsverhalten |
EP2338931A1 (de) * | 2009-12-23 | 2011-06-29 | Borealis AG | Blasfolienqualität mit verbesserter Festigkeit, Transparenz und verbessertem Verarbeitungsverhalten |
EP2386604B1 (de) * | 2010-04-20 | 2018-11-28 | Borealis AG | Polyproylenflaschen |
KR102339229B1 (ko) * | 2016-12-15 | 2021-12-14 | 아부 다비 폴리머스 씨오. 엘티디 (보르쥬) 엘엘씨. | 개선된 산소 장벽 속성을 가진 비-배향된 필름의 제조 방법 |
CN107685518A (zh) * | 2017-10-17 | 2018-02-13 | 安徽松泰包装材料有限公司 | 一种包装用cpp薄膜及其制备方法 |
BR112022010608A2 (pt) | 2019-12-05 | 2022-08-16 | Borealis Ag | Filme multicamada com propriedades aprimoradas |
CA3196199A1 (en) | 2020-10-19 | 2022-04-28 | Susanne Margarete KAHLEN | Polyolefin composition comprising polypropylene homopolymer and recycled plastic material |
PL4079488T3 (pl) | 2021-04-21 | 2024-03-25 | Borealis Ag | Kompozycja poliolefinowa zawierająca homopolimer polipropylenu oraz materiał tworzywa sztucznego regenerowanego |
EP4194502A1 (de) | 2021-12-13 | 2023-06-14 | Borealis AG | Polyolefinzusammensetzung mit polypropylenhomopolymer und recyceltem kunststoffmaterial |
EP4345135A1 (de) | 2022-09-30 | 2024-04-03 | Borealis AG | Polyolefinzusammensetzung mit polypropylenhomopolymer, polypropylenblockcopolymer und recyceltem kunststoffmaterial |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2908381C2 (de) * | 1979-03-03 | 1982-09-02 | Hoechst Ag, 6000 Frankfurt | Leicht zu öffnende Folienpackung sowie Verfahren zu ihrer Herstellung |
JPH02301435A (ja) * | 1989-05-17 | 1990-12-13 | Toray Ind Inc | 防湿防臭ポリプロピレン積層体 |
IT1248993B (it) * | 1990-06-25 | 1995-02-11 | Moplefan Spa | Pellicole poliolefiniche impermeabili ai gas e ai vapori e processo per la loro produzione |
DE4128820C2 (de) * | 1991-08-30 | 2001-04-12 | Hoechst Trespaphan Gmbh | Verbundfolie mit guter Sauerstoffbarriere |
IT1260497B (it) * | 1992-05-29 | 1996-04-09 | Himont Inc | Polimeri cristallini del propilene aventi migliorata processabilita' allo stato e processo per la loro preparazione |
US5318842A (en) * | 1992-12-03 | 1994-06-07 | Himont Incorporated | Biaxially oriented propylene polymer film or sheet articles |
IT1271418B (it) * | 1993-08-11 | 1997-05-28 | Himont Inc | Manufatti in film cast costituiti da polimeri propilenici |
JPH07330922A (ja) * | 1994-06-06 | 1995-12-19 | Toray Ind Inc | 金属蒸着用未延伸ポリプロピレンフイルム |
-
2001
- 2001-10-04 EP EP01123752A patent/EP1300239A1/de not_active Withdrawn
-
2002
- 2002-10-02 CN CNB028221850A patent/CN100572048C/zh not_active Expired - Lifetime
- 2002-10-02 RU RU2004113444/04A patent/RU2294343C2/ru active
- 2002-10-02 EP EP02800592A patent/EP1439957B1/de not_active Expired - Lifetime
- 2002-10-02 WO PCT/EP2002/011050 patent/WO2003031174A2/en active IP Right Grant
- 2002-10-02 DE DE60204974T patent/DE60204974T2/de not_active Expired - Lifetime
- 2002-10-02 ES ES02800592T patent/ES2243796T3/es not_active Expired - Lifetime
- 2002-10-02 JP JP2003534184A patent/JP2005504864A/ja active Pending
- 2002-10-02 AT AT02800592T patent/ATE299097T1/de not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO03031174A3 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2418237A1 (de) | 2010-08-12 | 2012-02-15 | Borealis AG | Leicht abziehbarer Polypropylen-Film ohne Nocke |
WO2012020106A1 (en) | 2010-08-12 | 2012-02-16 | Borealis Ag | Easy tear polypropylene film without notch |
EP2743293A1 (de) | 2010-08-12 | 2014-06-18 | Borealis AG | Leicht abziehbarer Polypropylen-Film ohne Nocke |
Also Published As
Publication number | Publication date |
---|---|
DE60204974D1 (de) | 2005-08-11 |
EP1439957B1 (de) | 2005-07-06 |
CN100572048C (zh) | 2009-12-23 |
CN1582230A (zh) | 2005-02-16 |
JP2005504864A (ja) | 2005-02-17 |
DE60204974T2 (de) | 2006-05-18 |
WO2003031174A3 (en) | 2003-12-11 |
RU2004113444A (ru) | 2005-10-10 |
WO2003031174A2 (en) | 2003-04-17 |
RU2294343C2 (ru) | 2007-02-27 |
ATE299097T1 (de) | 2005-07-15 |
ES2243796T3 (es) | 2005-12-01 |
EP1300239A1 (de) | 2003-04-09 |
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